print(4 + 1)
a = 10
b = 3
print('a - b:', a - b)  # 7
print('a * 4:', a * 4)  # 40
print('a / b :', a / b)  # 3.333
print('a // b :', a // b)  # 3  整除，取整
print('a % b :', a % b)  # 1 获取余数，求模
print('a ** 3 :', a ** 3)  # 1000 幂运算
print('3 + 2 * (4 ** 2) :', 3 + 2 * (4 ** 2))  # 35
